Question # 1

A newly prepared radioactive nuclide has a decay constant Lamda of 10-6 s-1 What is the approximate half life of the nuclide.

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1 hour

1 day

1 week

1 month

In the fusion process, there are

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Hydrogen isotopes

Helium Isotopes

Carbon isotopes

Oxygen isotopes

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

When using the formula E = h lambda what unit should energy have.

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Joule

Watt second

Newton metre

Electron volt

The mass of an alpha particle is.

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2 u

4 u

6 u

8 u

The chemical behavior of an atom is determined by

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Mass number

Number of Isotopes

Atomic number

Binding energy

The SI unit of absorbed dose in.

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Bel

Weber

Rem

Grey

The most readily fissionable isotope of uranium has atomic mass of

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234

235

236

238

Radioactive substances do not emit

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Alpha particles

Beta particles

Gama rays

Neutrons

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

Which particle is removed by a photon.

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Quark

Electron

Proton

Neutron

The particles less in mass than protons are

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Measons

Bosons

Baryons

Nucleons

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

In radiotherapy X-rays are used to.

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Treat cancer

Delect bone fracture

Cure heart diseasee

All of the above

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

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